dc.creator Struck, C. W. en_US dc.creator Fonger, W. H. en_US dc.date.accessioned 2006-06-15T13:21:12Z dc.date.available 2006-06-15T13:21:12Z dc.date.issued 1970 en_US dc.identifier 1970-S-2 en_US dc.identifier.uri http://hdl.handle.net/1811/8527 dc.description $^{1}$Struck, C. W. and Fonger, W. H., Electrochemical Society Extended Abstracts, Spring Meeting, Los Angeles, California, May 10--15, 1970 (The Electrochemical Society, New York, 1970) p. 119."" en_US dc.description Author Institution: RCA Laboratories en_US dc.description.abstract Excitation into the $Eu^{+2}$ charge-transfer states (CTS) in $Y_{2} O_{2} S$ and $La_{2} O_{2} S$ leads partially to long-time energy storage or to loss, in addition to feeding the emitting $^{3} D$ states. We have explained both storage and loss as commencing with the dissociation of the $Eu^{+3}$ CTS into $Eu^{+2}$ and a free $hole.^{1}$ The amount of storage produced and also the rise-time transient response to excitation are both measures of CTS dissociation and give activation energies for dissociation of $1200 cm^{-1}$ in $Y_{2} O_{2}S, 1500 cm^{-1}$ in $La_{2} O_{2}S$. At room temperature, 1/5 of $La_{2} O_{2} S$ CTS excitations and 2/5 of $Y_{2} O_{2} S$ excitations dissociate. Losses prominent at high $Eu^{+3}$ content produce non-linearities, which are interpreted as showing that the loss is proportional to the product of $Eu^{+2}$ and trapped hole concentrations. We believe that the losses are due to the extra electrons at the $Eu^{+2}$ centers migrating through the Eu activators and recombining non-radiatively at the hole centers. en_US dc.format.extent 99810 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title DISSOCIATION OF THE $Eu^{+2}$ CHARGE-TRANSFER STATE INTO $Eu^{+2}$ AND A FREE HOLE IN Y AND La OXYSULFIDES en_US dc.type article en_US
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